review (S) for 6849984: Value methods for platform dependent math functions constant fold incorrectly

Vladimir Kozlov Vladimir.Kozlov at Sun.COM
Thu Jan 14 11:46:23 PST 2010

Looks good.


Tom Rodriguez wrote:
> On Jan 14, 2010, at 9:45 AM, Vladimir Kozlov wrote:
>> Christian Thalinger wrote:
>>> It's a little strange to generate the math intrinsics along with the
>>> arraycopy stubs in:
>>>  void generate_arraycopy_stubs() {
>> Yes, it could be new generate_math_stubs() but it be more changes.
> I actually hadn't intended to put them in with arraycopy.  I've moved them into their own function.
>>> Maybe I missed the point of this change, but why are we using the much
>>> more complicated C versions for these?
>>> +     // The intrinsic version of these seem to return the same value as
>>> +     // the strict version.
>>> +     StubRoutines::_intrinsic_exp = SharedRuntime::dexp;
>>> +     StubRoutines::_intrinsic_pow = SharedRuntime::dpow;
>> There is no implementation of ExpD and PowD in (which is surprise - we missed it???)
> That is odd.  I'm honestly not sure whether the intrinsic versions of exp and pow return the same as fdlibm but I assumed it was true since we don't have an interpreter version of those intrinsics.
> I've updated the webrev with all the comments so far.
> tom
>> And it is also complex code - see it in
>> Vladimir
>>> Otherwise this looks good.
>>> -- Christian

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